Systems, apparatus and methods for port muting using explicit channel feedback

Abstract

The method includes transmitting, at least one user equipment (UE) node, configuration to feedback one or more downlink channel state information (CSI) feedback reports corresponding to one or more Channel state information-Reference signal (CSI-reference signal (RS) port muting patterns to the transceiver node, information regarding the one or more CSI-RS port muting patterns being included in the configuration, receiving, from the at least one UE node, one or more downlink CSI feedback reports, the one or more downlink CSI feedback reports comprising at least one of one or more individual CSI feedback reports corresponding to the one or more CSI-RS port muting patterns, a single multi-CSI feedback report corresponding to the one or more CSI-RS port muting patterns, and one or more CSI feedback reports comprising one or more quantized versions of at least a singular vector decomposition (SVD) decomposed downlink channel matrix corresponding to the one or more CSI-RS port muting patterns, and determining to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port belonging to the transceiver node, based on the one or more downlink CSI feedback reports.

What is claimed is: 
     
         1 . A method performed by a transceiver node in a wireless communication system, the method comprising:
 transmitting, at least one user equipment (UE) node, configuration to feedback one or more downlink channel state information (CSI) feedback reports corresponding to one or more Channel state information-Reference signal (CSI-reference signal (RS) port muting patterns to the transceiver node, wherein information regarding the one or more CSI-RS port muting patterns is included in the configuration;   receiving, from the at least one UE node, one or more downlink CSI feedback reports, wherein the one or more downlink CSI feedback reports comprise at least one of one or more individual CSI feedback reports corresponding to the one or more CSI- RS port muting patterns, a single multi-CSI feedback report corresponding to the one or more CSI-RS port muting patterns, and one or more CSI feedback reports comprising one or more quantized versions of at least a singular vector decomposition (SVD) decomposed downlink channel matrix corresponding to the one or more CSI-RS port muting patterns; and   determining to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute at least one CSI-RS port belonging to the transceiver node, based on the one or more downlink CSI feedback reports.   
     
     
         2 . The method of  claim 1 , wherein the receiving of the one or more downlink CSI feedback reports comprises:
 receiving, from the at least one UE node, at least one CSI feedback report having quantized version of an SVD decomposed downlink channel matrix for the one or more CSI-RS port muting patterns, wherein the at least one CSI feedback report comprises at least one precoding matrix indicator (PMI) parameter, and wherein the at least one PMI parameter comprises at least one of: one or more right singular vectors, one or more left singular vectors, and one or more singular values corresponding to the SVD decomposed downlink channel matrix for the one or more CSI-RS port muting patterns, and wherein the determining to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port comprises:   determining, by the at least one transceiver node, to mute the at least one CSI-RS port belonging to the one or more CSI-RS port muting patterns or to unmute the at least one CSI-RS port belonging to the at least one transceiver node, based on the received at least one CSI feedback report.   
     
     
         3 . The method of  claim 1 , further comprising:
 transmitting, to the at least one UE node, one or more downlink CSI-RS, wherein the downlink CSI feedback reports are obtained based on the one or more downlink CSI for the one or more CSI-RS port muting patterns.   
     
     
         4 . The method of  claim 1 , wherein the one or more CSI-RS port muting patterns are at least one of:
 one or more fully unmuted CSI-RS port muting patterns; and   one or more partially unmuted CSI-RS port muting patterns.   
     
     
         5 . The method of  claim 1 , further comprising:
 receiving, from the at least one UE node, one or more energy feedback reports comprising the one or more fractions of energy as captured for the one or more CSI-RS port muting patterns, wherein the determining to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port comprises:   determining to mute the at least one CSI-RS port belonging to the one or more CSI-RS port muting patterns or to unmute the at least one CSI-RS port belonging to the at least one transceiver node, based on the one or more energy feedback reports.   
     
     
         6 . The method of  claim 1 , further comprising:
 receiving, from the at least one UE node, one or more energy-feedback reports on estimated fraction of energy captured by the downlink channel matrix for the one or more CSI-RS muting patterns; and   performing comparison analysis of the one or more energy-feedback report with a history of one or more pre-stored energy-feedback reports corresponding to the one or more CSI-RS port muting patterns, wherein the determining to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port comprises determining to unmute, at least one CSI-RS port belonging to the at least one transceiver node, based on the one or more CSI feedback reports and output of the comparison analysis.   
     
     
         7 . The method of  claim 1 , further comprising:
 transmitting, to the at least one UE node, configuration to measure the one or more downlink CSI for the one or more CSI-RS port muting patterns.   
     
     
         8 . The method of  claim 2 , wherein the one or more right singular vectors and the one or more left singular vectors comprise at least one of:
 one or more wideband and long-term downlink channel properties; and   one or more sub-band and short-term downlink channel properties.   
     
     
         9 . The method of  claim 1 , wherein the determining to mute at least one CSI- RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port comprises determining whether to mute the at least one CSI-RS port belonging to the one or more CSI-RS port muting patterns or to unmute the at least one CSI-RS port belonging to the transceiver node, by way of estimating residual energy, which has not been fed back, in the one or more downlink channels corresponding to the at least one CSI-RS port muting pattern of the UE node. 
     
     
         10 . The method of  claim 1 , further comprising:
 transmitting, to the at least one UE node, configuration to measure a plurality of CSI corresponding to a plurality of CSI-RS port muting patterns, as configured by the at least one transceiver node;   receiving, from the at least one UE node, a plurality of CSI feedback reports corresponding to the plurality of CSI-RS port muting patterns, wherein the plurality of CSI feedback reports comprising a plurality of corresponding PMIs;   receiving, from the at least one UE node, a plurality of energy-feedback reports on estimated fraction of energy captured for the plurality of CSI-RS port muting patterns;   performing comparison analysis, of the plurality of energy-feedback reports with a history of plurality of pre-stored energy-feedback reports corresponding to the plurality of CSI-RS port muting patterns; and   determining by the at least one transceiver node, to mute at least one CSI-RS port belonging to the one or more CSI-RS port muting patterns or to unmute at least one CSI-RS port belonging to the at least one transceiver node based on the plurality of CSI feedback reports, the plurality of energy-feedback reports and output of the comparison analysis.   
     
     
         11 . The method of  claim 10 , wherein the fraction of captured energy for the one or more CSI-RS port muting patterns is estimated from a ratio of, one or more singular values of the downlink channel matrix corresponding to the one or more CSI- RS port muting patterns, to a diagonal matrix containing one or more singular values in descending order of magnitude of the downlink channel matrix. 
     
     
         12 . The method of  claim 1 , further comprising:
 determining at least one downlink channel matrix for one or more CSI-RS transmission corresponding to the one or more CSI-RS port muting patterns, wherein the at least one downlink channel matrix is obtained from at least one left precoder matrix having one or more left singular vectors, wherein the at least one left precoder matrix has total number of rows equal to total number of CSI-RS receiving antenna ports at a CSI-RS receiver side, and total number of columns equal to total number of CSI-RS layers configured by the at least one transceiver node, at least one right precoder matrix having one or more right singular vectors, wherein the at least one right precoder matrix has total number of rows equal to total number of CSI-RS transmit ports at a CSI-RS transmitter side, and total number of columns equal to total number of CSI-RS layers configured by the at least one transceiver node, and one or more singular values of an estimated downlink channel matrix as obtained from the at least one UE node, wherein the at least one left precoder matrix is obtained from at least one appropriate beamforming basis vector comprising at least one of at least one oversampled 2D discrete Fourier transform (2D-DFT) basis, at least one Slepian basis, and at least one polynomial basis, and wherein the at least one right precoder matrix is obtained from at least one appropriate beamforming basis vector comprising at least one of at least one oversampled 2D-DFT basis, at least one Slepian basis, and at least one polynomial basis.   
     
     
         13 . The method of  claim 1 , wherein the one or more downlink CSI corresponding to the one or more CSI-RS port muting patterns comprise one or more channel quality indicator (CQIs), one or more precoder matrix indicators (PMIs) and one or more rank indicator (RIs). 
     
     
         14 . A user equipment (UE) node comprising:
 memory storing one or more computer programs; and   one or more processors coupled with the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors, cause UE node to:   receive, from the transceiver node, configuration to feedback one or more downlink channel state information (CSI) feedback reports corresponding to one or more Channel state information-Reference signal (CSI-reference signal (RS) port muting patterns to the transceiver node, wherein information regarding the one or more CSI-RS port muting patterns is included in the configuration, measure one or more downlink channel state information (CSI), and transmit one or more CSI feedback reports to a transceiver node, wherein the one or more CSI feedback reports comprise at least one of, one or more individual CSI feedback reports corresponding to the one or more channel state information-reference signal (CSI-RS) port muting patterns, a single multi-CSI feedback report corresponding to the one or more CSI-RS port muting patterns, and one or more CSI feedback reports having quantized version of at least an SVD decomposed downlink channel matrix for the one or more CSI-RS port muting patterns.   
     
     
         15 . The UE node of  claim 14 , wherein the one or more computer programs further include computer-executable instructions that, when executed by the one or more processors, cause the at least one UE node to:
 estimate one or more fractions of captured energy for the one or more CSI-RS port muting patterns, wherein the fractions of captured energy is estimated from one or more singular values of the downlink channel matrix corresponding to the one or more CSI-RS port muting patterns; and   transmit, to the transceiver node, one or more energy-feedback reports comprising one or more fractions of estimated energy captured for the one or more CSI- RS port muting patterns.   
     
     
         16 . A transceiver node comprising:
 memory storing one or more computer programs; and   one or more processors communicatively coupled with the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors, cause the at least one transceiver node to:   transmit, at least one user equipment (UE) node, configuration to feedback one or more downlink channel state information (CSI) feedback reports corresponding to one or more Channel state information-Reference signal (CSI- reference signal (RS) port muting patterns to the at least one transceiver node, wherein information regarding the one or more CSI-RS port muting patterns is included in the configuration, receive, from the at least one UE node, one or more downlink CSI feedback reports, wherein the one or more downlink CSI feedback reports comprise at least one of one or more individual CSI feedback reports corresponding to the one or more CSI-RS port muting patterns, a single multi- CSI feedback report corresponding to the one or more CSI-RS port muting patterns, and one or more CSI feedback reports comprising one or more quantized versions of at least a singular vector decomposition (SVD) decomposed downlink channel matrix corresponding to the one or more CSI-RS port muting patterns, and determine to mute at least one CSI-RS port belonging to at least one of the one or more port muting patterns or to unmute the at least one CSI-RS port, based on the one or more downlink CSI feedback reports.   
     
     
         17 . The transceiver node of  claim 16 , wherein one or more computer programs further include computer-executable instructions that, when executed by the one or more processors, cause the at least one transceiver node to:
 receive from the at least one UE node, one or more estimated fractions of energy captured for the one or more CSI-RS port muting patterns, wherein the fractions of captured energy is estimated from one or more singular values of the downlink channel matrix corresponding to the one or more CSI-RS port muting patterns; and   determine to mute the at least one CSI-RS port belonging to the one or more CSI- RS port muting patterns or to unmute the at least one CSI-RS port belonging to the at least one transceiver node, based on the received one or more estimated fractions of energy.   
     
     
         18 . The transceiver node of  claim 16 , wherein the one or more CSI-RS port muting patterns are at least one of:
 one or more fully unmuted CSI-RS port muting patterns; and   one or more partially unmuted CSI-RS port muting patterns.   
     
     
         19 . The transceiver node of  claim 17 , wherein the fraction of captured energy for the one or more CSI-RS port muting patterns is estimated from a ratio of, one or more singular values of downlink channel matrix corresponding to the one or more CSI- RS port muting patterns, to a diagonal matrix containing one or more singular values in descending order of magnitude of the downlink channel matrix. 
     
     
         20 . A method performed by a user equipment (UE) node comprising:
 receiving, from the transceiver node, configuration to feedback one or more downlink channel state information (CSI) feedback reports corresponding to one or more Channel state information-Reference signal (CSI-reference signal (RS) port muting patterns to the transceiver node, wherein information regarding the one or more CSI-RS port muting patterns is included in the configuration;   measuring one or more downlink channel state information (CSI); and   transmitting one or more CSI feedback reports to a transceiver node, wherein the one or more CSI feedback reports comprise at least one of, one or more individual CSI feedback reports corresponding to the one or more channel state information-reference signal (CSI-RS) port muting patterns, a single multi-CSI feedback report corresponding to the one or more CSI-RS port muting patterns, and one or more CSI feedback reports having quantized version of at least an SVD decomposed downlink channel matrix for the one or more CSI-RS port muting patterns.